Add Turning Off Search Highlighting as a vim til

vim/turning-of-search-highlighting.md

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+# Turning Off Search Highlighting
+
+After performing a search for a common word, you end up with that word
+highlighted all over the place. To turn it off, I generally use the `set`
+command with `no` prepended to the `hlsearch` option -- as is convention in
+Vim.
+
+It turns out though, that `nohlsearch` is a command in its own right. I can
+save a few characters by invoking:
+
+```
+:nohlsearch
+```
+
+See `:h nohlsearch` for more details.